Carbon fibre reinforced plastic (CFRP) composites have significant properties such as high specific strength, specific stiffness and easy of tailoring to a particular application, which made them very attractive for structural ...

For quality assurance in the manufacture of automotive parts, the integrity of the laser-beam welds joining steel parts must be monitored. A primary concern is to detect weld defects fast, reliably and cost-effectively. Therefore, a considerable number of on-line inspection systems have being developed to improve weld quality and reduce overall costs. All the systems, for monitoring the photonic emissions from the weld pool, adopt measurement schemes in which wired sensors output...

The reproducibility of laser welded joints in highly reflective materials such as copper and aluminium is a difficult issue. Fluctuating energy deposition resulting from unsteady material and surface properties leads to unreliable processing conditions. The adaptation of...

Laser welding are well-known welding processes applied in the automotive. Because the process monitoring is beneficial for maintaining quality and improving productivity, various monitoring techniques have been proposed for laser welding. In this study, we coaxially monitored the welding phenomena during laser lap welding. Some welding characteristics ...

Direct metal deposition plays an important role in rapid manufacturing geometrically complicated, dense, near net shape components. A large number of parameters are involved in the deposition process. Its present development stagnates in its control. A good understanding of the laser material processing and a well designed controlling system are essential for the system reliability. This paper addresses the development of a linear model based generalized predictive control system ...

The method of the quality control in the laser welding system has various techniques. It is necessary to manage not only in-process but also pre-process and post-process for improvement of the welding quality. In this paper, the fault condition sensing technique is proposed by the waveform analysis of the phys...

This article presents investigations carried out on the generation 3D structures of TA6V or Inconel718. In order to generate 3D complex structure in laser cladding, it is necessary to study the possibility of building materials with a large overhung angle. This can be done by rotation of the substrate or of the nozzle. This article presents results on building structu...

Thin disk lasers as well as fiber lasers are distinguished by their strong focusability and high efficiency. The stronger focusability can be used for an expansion of the application range. Weld seams of unprecedented high aspect ratios independent of the laser type can be achieved which are only known from the electron beam welding until now. Based on results of thin disk and fiber laser experiments it has been shown in earlier publications that the influence of the div...

Laser welding has become one of the most expanding areas for industrial laser applications. The increasing cost effectiveness of the laser process is accompanied by the development of new high efficient laser sources, such as the new disk laser. TRUMPF introduced the disk laser several years ago, and today it has become the most reliable laser tool on...